net/ceph/osd_client.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/err.h>
   5 #include <linux/highmem.h>
   6 #include <linux/mm.h>
   7 #include <linux/pagemap.h>
   8 #include <linux/slab.h>
   9 #include <linux/uaccess.h>
  10 #ifdef CONFIG_BLOCK
  11 #include <linux/bio.h>
  12 #endif
  13
  14 #include <linux/ceph/libceph.h>
  15 #include <linux/ceph/osd_client.h>
  16 #include <linux/ceph/messenger.h>
  17 #include <linux/ceph/decode.h>
  18 #include <linux/ceph/auth.h>
  19 #include <linux/ceph/pagelist.h>
  20
  21 #define OSD_OP_FRONT_LEN        4096
  22 #define OSD_OPREPLY_FRONT_LEN   512
  23
  24 static const struct ceph_connection_operations osd_con_ops;
  25
  26 static void send_queued(struct ceph_osd_client *osdc);
  27 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
  28 static void __register_request(struct ceph_osd_client *osdc,
  29                                struct ceph_osd_request *req);
  30 static void __unregister_linger_request(struct ceph_osd_client *osdc,
  31                                         struct ceph_osd_request *req);
  32 static void __send_request(struct ceph_osd_client *osdc,
  33                            struct ceph_osd_request *req);
  34
  35 static int op_has_extent(int op)
  36 {
  37         return (op == CEPH_OSD_OP_READ ||
  38                 op == CEPH_OSD_OP_WRITE);
  39 }
  40
  41 int ceph_calc_raw_layout(struct ceph_file_layout *layout,
  42                         u64 off, u64 *plen, u64 *bno,
  43                         struct ceph_osd_request *req,
  44                         struct ceph_osd_req_op *op)
  45 {
  46         u64 orig_len = *plen;
  47         u64 objoff, objlen;    /* extent in object */
  48         int r;
  49
  50         /* object extent? */
  51         r = ceph_calc_file_object_mapping(layout, off, orig_len, bno,
  52                                           &objoff, &objlen);
  53         if (r < 0)
  54                 return r;
  55         if (objlen < orig_len) {
  56                 *plen = objlen;
  57                 dout(" skipping last %llu, final file extent %llu~%llu\n",
  58                      orig_len - *plen, off, *plen);
  59         }
  60
  61         if (op_has_extent(op->op)) {
  62                 u32 osize = le32_to_cpu(layout->fl_object_size);
  63                 op->extent.offset = objoff;
  64                 op->extent.length = objlen;
  65                 if (op->extent.truncate_size <= off - objoff) {
  66                         op->extent.truncate_size = 0;
  67                 } else {
  68                         op->extent.truncate_size -= off - objoff;
  69                         if (op->extent.truncate_size > osize)
  70                                 op->extent.truncate_size = osize;
  71                 }
  72         }
  73         req->r_num_pages = calc_pages_for(off, *plen);
  74         req->r_page_alignment = off & ~PAGE_MASK;
  75         if (op->op == CEPH_OSD_OP_WRITE)
  76                 op->payload_len = *plen;
  77
  78         dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
  79              *bno, objoff, objlen, req->r_num_pages);
  80         return 0;
  81 }
  82 EXPORT_SYMBOL(ceph_calc_raw_layout);
  83
  84 /*
  85  * Implement client access to distributed object storage cluster.
  86  *
  87  * All data objects are stored within a cluster/cloud of OSDs, or
  88  * "object storage devices."  (Note that Ceph OSDs have _nothing_ to
  89  * do with the T10 OSD extensions to SCSI.)  Ceph OSDs are simply
  90  * remote daemons serving up and coordinating consistent and safe
  91  * access to storage.
  92  *
  93  * Cluster membership and the mapping of data objects onto storage devices
  94  * are described by the osd map.
  95  *
  96  * We keep track of pending OSD requests (read, write), resubmit
  97  * requests to different OSDs when the cluster topology/data layout
  98  * change, or retry the affected requests when the communications
  99  * channel with an OSD is reset.
 100  */
 101
 102 /*
 103  * calculate the mapping of a file extent onto an object, and fill out the
 104  * request accordingly.  shorten extent as necessary if it crosses an
 105  * object boundary.
 106  *
 107  * fill osd op in request message.
 108  */
 109 static int calc_layout(struct ceph_vino vino,
 110                        struct ceph_file_layout *layout,
 111                        u64 off, u64 *plen,
 112                        struct ceph_osd_request *req,
 113                        struct ceph_osd_req_op *op)
 114 {
 115         u64 bno;
 116         int r;
 117
 118         r = ceph_calc_raw_layout(layout, off, plen, &bno, req, op);
 119         if (r < 0)
 120                 return r;
 121
 122         snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
 123         req->r_oid_len = strlen(req->r_oid);
 124
 125         return r;
 126 }
 127
 128 /*
 129  * requests
 130  */
 131 void ceph_osdc_release_request(struct kref *kref)
 132 {
 133         struct ceph_osd_request *req = container_of(kref,
 134                                                     struct ceph_osd_request,
 135                                                     r_kref);
 136
 137         if (req->r_request)
 138                 ceph_msg_put(req->r_request);
 139         if (req->r_con_filling_msg) {
 140                 dout("%s revoking pages %p from con %p\n", __func__,
 141                      req->r_pages, req->r_con_filling_msg);
 142                 ceph_msg_revoke_incoming(req->r_reply);
 143                 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
 144         }
 145         if (req->r_reply)
 146                 ceph_msg_put(req->r_reply);
 147         if (req->r_own_pages)
 148                 ceph_release_page_vector(req->r_pages,
 149                                          req->r_num_pages);
 150         ceph_put_snap_context(req->r_snapc);
 151         ceph_pagelist_release(&req->r_trail);
 152         if (req->r_mempool)
 153                 mempool_free(req, req->r_osdc->req_mempool);
 154         else
 155                 kfree(req);
 156 }
 157 EXPORT_SYMBOL(ceph_osdc_release_request);
 158
 159 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 160                                                struct ceph_snap_context *snapc,
 161                                                unsigned int num_op,
 162                                                bool use_mempool,
 163                                                gfp_t gfp_flags)
 164 {
 165         struct ceph_osd_request *req;
 166         struct ceph_msg *msg;
 167         size_t msg_size = sizeof(struct ceph_osd_request_head);
 168
 169         msg_size += num_op*sizeof(struct ceph_osd_op);
 170
 171         if (use_mempool) {
 172                 req = mempool_alloc(osdc->req_mempool, gfp_flags);
 173                 memset(req, 0, sizeof(*req));
 174         } else {
 175                 req = kzalloc(sizeof(*req), gfp_flags);
 176         }
 177         if (req == NULL)
 178                 return NULL;
 179
 180         req->r_osdc = osdc;
 181         req->r_mempool = use_mempool;
 182
 183         kref_init(&req->r_kref);
 184         init_completion(&req->r_completion);
 185         init_completion(&req->r_safe_completion);
 186         RB_CLEAR_NODE(&req->r_node);
 187         INIT_LIST_HEAD(&req->r_unsafe_item);
 188         INIT_LIST_HEAD(&req->r_linger_item);
 189         INIT_LIST_HEAD(&req->r_linger_osd);
 190         INIT_LIST_HEAD(&req->r_req_lru_item);
 191         INIT_LIST_HEAD(&req->r_osd_item);
 192
 193         /* create reply message */
 194         if (use_mempool)
 195                 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
 196         else
 197                 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
 198                                    OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
 199         if (!msg) {
 200                 ceph_osdc_put_request(req);
 201                 return NULL;
 202         }
 203         req->r_reply = msg;
 204
 205         ceph_pagelist_init(&req->r_trail);
 206
 207         /* create request message; allow space for oid */
 208         msg_size += MAX_OBJ_NAME_SIZE;
 209         if (snapc)
 210                 msg_size += sizeof(u64) * snapc->num_snaps;
 211         if (use_mempool)
 212                 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
 213         else
 214                 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
 215         if (!msg) {
 216                 ceph_osdc_put_request(req);
 217                 return NULL;
 218         }
 219
 220         memset(msg->front.iov_base, 0, msg->front.iov_len);
 221
 222         req->r_request = msg;
 223
 224         return req;
 225 }
 226 EXPORT_SYMBOL(ceph_osdc_alloc_request);
 227
 228 static void osd_req_encode_op(struct ceph_osd_request *req,
 229                               struct ceph_osd_op *dst,
 230                               struct ceph_osd_req_op *src)
 231 {
 232         dst->op = cpu_to_le16(src->op);
 233
 234         switch (src->op) {
 235         case CEPH_OSD_OP_READ:
 236         case CEPH_OSD_OP_WRITE:
 237                 dst->extent.offset =
 238                         cpu_to_le64(src->extent.offset);
 239                 dst->extent.length =
 240                         cpu_to_le64(src->extent.length);
 241                 dst->extent.truncate_size =
 242                         cpu_to_le64(src->extent.truncate_size);
 243                 dst->extent.truncate_seq =
 244                         cpu_to_le32(src->extent.truncate_seq);
 245                 break;
 246
 247         case CEPH_OSD_OP_GETXATTR:
 248         case CEPH_OSD_OP_SETXATTR:
 249         case CEPH_OSD_OP_CMPXATTR:
 250                 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 251                 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 252                 dst->xattr.cmp_op = src->xattr.cmp_op;
 253                 dst->xattr.cmp_mode = src->xattr.cmp_mode;
 254                 ceph_pagelist_append(&req->r_trail, src->xattr.name,
 255                                      src->xattr.name_len);
 256                 ceph_pagelist_append(&req->r_trail, src->xattr.val,
 257                                      src->xattr.value_len);
 258                 break;
 259         case CEPH_OSD_OP_CALL:
 260                 dst->cls.class_len = src->cls.class_len;
 261                 dst->cls.method_len = src->cls.method_len;
 262                 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
 263
 264                 ceph_pagelist_append(&req->r_trail, src->cls.class_name,
 265                                      src->cls.class_len);
 266                 ceph_pagelist_append(&req->r_trail, src->cls.method_name,
 267                                      src->cls.method_len);
 268                 ceph_pagelist_append(&req->r_trail, src->cls.indata,
 269                                      src->cls.indata_len);
 270                 break;
 271         case CEPH_OSD_OP_ROLLBACK:
 272                 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
 273                 break;
 274         case CEPH_OSD_OP_STARTSYNC:
 275                 break;
 276         case CEPH_OSD_OP_NOTIFY:
 277                 {
 278                         __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
 279                         __le32 timeout = cpu_to_le32(src->watch.timeout);
 280
 281                         ceph_pagelist_append(&req->r_trail,
 282                                                 &prot_ver, sizeof(prot_ver));
 283                         ceph_pagelist_append(&req->r_trail,
 284                                                 &timeout, sizeof(timeout));
 285                 }
 286         case CEPH_OSD_OP_NOTIFY_ACK:
 287         case CEPH_OSD_OP_WATCH:
 288                 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
 289                 dst->watch.ver = cpu_to_le64(src->watch.ver);
 290                 dst->watch.flag = src->watch.flag;
 291                 break;
 292         default:
 293                 pr_err("unrecognized osd opcode %d\n", dst->op);
 294                 WARN_ON(1);
 295                 break;
 296         }
 297         dst->payload_len = cpu_to_le32(src->payload_len);
 298 }
 299
 300 /*
 301  * build new request AND message
 302  *
 303  */
 304 void ceph_osdc_build_request(struct ceph_osd_request *req,
 305                              u64 off, u64 len, unsigned int num_op,
 306                              struct ceph_osd_req_op *src_ops,
 307                              struct ceph_snap_context *snapc, u64 snap_id,
 308                              struct timespec *mtime)
 309 {
 310         struct ceph_msg *msg = req->r_request;
 311         struct ceph_osd_request_head *head;
 312         struct ceph_osd_req_op *src_op;
 313         struct ceph_osd_op *op;
 314         void *p;
 315         size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 316         int flags = req->r_flags;
 317         u64 data_len = 0;
 318         int i;
 319
 320         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
 321
 322         head = msg->front.iov_base;
 323         head->snapid = cpu_to_le64(snap_id);
 324         op = (void *)(head + 1);
 325         p = (void *)(op + num_op);
 326
 327         req->r_snapc = ceph_get_snap_context(snapc);
 328
 329         head->client_inc = cpu_to_le32(1); /* always, for now. */
 330         head->flags = cpu_to_le32(flags);
 331         if (flags & CEPH_OSD_FLAG_WRITE)
 332                 ceph_encode_timespec(&head->mtime, mtime);
 333         BUG_ON(num_op > (unsigned int) ((u16) -1));
 334         head->num_ops = cpu_to_le16(num_op);
 335
 336         /* fill in oid */
 337         head->object_len = cpu_to_le32(req->r_oid_len);
 338         memcpy(p, req->r_oid, req->r_oid_len);
 339         p += req->r_oid_len;
 340
 341         src_op = src_ops;
 342         while (num_op--)
 343                 osd_req_encode_op(req, op++, src_op++);
 344
 345         data_len += req->r_trail.length;
 346
 347         if (snapc) {
 348                 head->snap_seq = cpu_to_le64(snapc->seq);
 349                 head->num_snaps = cpu_to_le32(snapc->num_snaps);
 350                 for (i = 0; i < snapc->num_snaps; i++) {
 351                         put_unaligned_le64(snapc->snaps[i], p);
 352                         p += sizeof(u64);
 353                 }
 354         }
 355
 356         if (flags & CEPH_OSD_FLAG_WRITE) {
 357                 req->r_request->hdr.data_off = cpu_to_le16(off);
 358                 req->r_request->hdr.data_len = cpu_to_le32(len + data_len);
 359         } else if (data_len) {
 360                 req->r_request->hdr.data_off = 0;
 361                 req->r_request->hdr.data_len = cpu_to_le32(data_len);
 362         }
 363
 364         req->r_request->page_alignment = req->r_page_alignment;
 365
 366         BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
 367         msg_size = p - msg->front.iov_base;
 368         msg->front.iov_len = msg_size;
 369         msg->hdr.front_len = cpu_to_le32(msg_size);
 370         return;
 371 }
 372 EXPORT_SYMBOL(ceph_osdc_build_request);
 373
 374 /*
 375  * build new request AND message, calculate layout, and adjust file
 376  * extent as needed.
 377  *
 378  * if the file was recently truncated, we include information about its
 379  * old and new size so that the object can be updated appropriately.  (we
 380  * avoid synchronously deleting truncated objects because it's slow.)
 381  *
 382  * if @do_sync, include a 'startsync' command so that the osd will flush
 383  * data quickly.
 384  */
 385 struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 386                                                struct ceph_file_layout *layout,
 387                                                struct ceph_vino vino,
 388                                                u64 off, u64 *plen,
 389                                                int opcode, int flags,
 390                                                struct ceph_snap_context *snapc,
 391                                                int do_sync,
 392                                                u32 truncate_seq,
 393                                                u64 truncate_size,
 394                                                struct timespec *mtime,
 395                                                bool use_mempool, int num_reply,
 396                                                int page_align)
 397 {
 398         struct ceph_osd_req_op ops[2];
 399         struct ceph_osd_request *req;
 400         unsigned int num_op = 1;
 401         int r;
 402
 403         memset(&ops, 0, sizeof ops);
 404
 405         ops[0].op = opcode;
 406         ops[0].extent.truncate_seq = truncate_seq;
 407         ops[0].extent.truncate_size = truncate_size;
 408
 409         if (do_sync) {
 410                 ops[1].op = CEPH_OSD_OP_STARTSYNC;
 411                 num_op++;
 412         }
 413
 414         req = ceph_osdc_alloc_request(osdc, snapc, num_op, use_mempool,
 415                                         GFP_NOFS);
 416         if (!req)
 417                 return ERR_PTR(-ENOMEM);
 418         req->r_flags = flags;
 419
 420         /* calculate max write size */
 421         r = calc_layout(vino, layout, off, plen, req, ops);
 422         if (r < 0)
 423                 return ERR_PTR(r);
 424         req->r_file_layout = *layout;  /* keep a copy */
 425
 426         /* in case it differs from natural (file) alignment that
 427            calc_layout filled in for us */
 428         req->r_num_pages = calc_pages_for(page_align, *plen);
 429         req->r_page_alignment = page_align;
 430
 431         ceph_osdc_build_request(req, off, *plen, num_op, ops,
 432                                 snapc, vino.snap, mtime);
 433
 434         return req;
 435 }
 436 EXPORT_SYMBOL(ceph_osdc_new_request);
 437
 438 /*
 439  * We keep osd requests in an rbtree, sorted by ->r_tid.
 440  */
 441 static void __insert_request(struct ceph_osd_client *osdc,
 442                              struct ceph_osd_request *new)
 443 {
 444         struct rb_node **p = &osdc->requests.rb_node;
 445         struct rb_node *parent = NULL;
 446         struct ceph_osd_request *req = NULL;
 447
 448         while (*p) {
 449                 parent = *p;
 450                 req = rb_entry(parent, struct ceph_osd_request, r_node);
 451                 if (new->r_tid < req->r_tid)
 452                         p = &(*p)->rb_left;
 453                 else if (new->r_tid > req->r_tid)
 454                         p = &(*p)->rb_right;
 455                 else
 456                         BUG();
 457         }
 458
 459         rb_link_node(&new->r_node, parent, p);
 460         rb_insert_color(&new->r_node, &osdc->requests);
 461 }
 462
 463 static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
 464                                                  u64 tid)
 465 {
 466         struct ceph_osd_request *req;
 467         struct rb_node *n = osdc->requests.rb_node;
 468
 469         while (n) {
 470                 req = rb_entry(n, struct ceph_osd_request, r_node);
 471                 if (tid < req->r_tid)
 472                         n = n->rb_left;
 473                 else if (tid > req->r_tid)
 474                         n = n->rb_right;
 475                 else
 476                         return req;
 477         }
 478         return NULL;
 479 }
 480
 481 static struct ceph_osd_request *
 482 __lookup_request_ge(struct ceph_osd_client *osdc,
 483                     u64 tid)
 484 {
 485         struct ceph_osd_request *req;
 486         struct rb_node *n = osdc->requests.rb_node;
 487
 488         while (n) {
 489                 req = rb_entry(n, struct ceph_osd_request, r_node);
 490                 if (tid < req->r_tid) {
 491                         if (!n->rb_left)
 492                                 return req;
 493                         n = n->rb_left;
 494                 } else if (tid > req->r_tid) {
 495                         n = n->rb_right;
 496                 } else {
 497                         return req;
 498                 }
 499         }
 500         return NULL;
 501 }
 502
 503 /*
 504  * Resubmit requests pending on the given osd.
 505  */
 506 static void __kick_osd_requests(struct ceph_osd_client *osdc,
 507                                 struct ceph_osd *osd)
 508 {
 509         struct ceph_osd_request *req, *nreq;
 510         int err;
 511
 512         dout("__kick_osd_requests osd%d\n", osd->o_osd);
 513         err = __reset_osd(osdc, osd);
 514         if (err)
 515                 return;
 516
 517         list_for_each_entry(req, &osd->o_requests, r_osd_item) {
 518                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 519                 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
 520                      osd->o_osd);
 521                 if (!req->r_linger)
 522                         req->r_flags |= CEPH_OSD_FLAG_RETRY;
 523         }
 524
 525         list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
 526                                  r_linger_osd) {
 527                 /*
 528                  * reregister request prior to unregistering linger so
 529                  * that r_osd is preserved.
 530                  */
 531                 BUG_ON(!list_empty(&req->r_req_lru_item));
 532                 __register_request(osdc, req);
 533                 list_add(&req->r_req_lru_item, &osdc->req_unsent);
 534                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 535                 __unregister_linger_request(osdc, req);
 536                 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
 537                      osd->o_osd);
 538         }
 539 }
 540
 541 /*
 542  * If the osd connection drops, we need to resubmit all requests.
 543  */
 544 static void osd_reset(struct ceph_connection *con)
 545 {
 546         struct ceph_osd *osd = con->private;
 547         struct ceph_osd_client *osdc;
 548
 549         if (!osd)
 550                 return;
 551         dout("osd_reset osd%d\n", osd->o_osd);
 552         osdc = osd->o_osdc;
 553         down_read(&osdc->map_sem);
 554         mutex_lock(&osdc->request_mutex);
 555         __kick_osd_requests(osdc, osd);
 556         mutex_unlock(&osdc->request_mutex);
 557         send_queued(osdc);
 558         up_read(&osdc->map_sem);
 559 }
 560
 561 /*
 562  * Track open sessions with osds.
 563  */
 564 static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
 565 {
 566         struct ceph_osd *osd;
 567
 568         osd = kzalloc(sizeof(*osd), GFP_NOFS);
 569         if (!osd)
 570                 return NULL;
 571
 572         atomic_set(&osd->o_ref, 1);
 573         osd->o_osdc = osdc;
 574         osd->o_osd = onum;
 575         RB_CLEAR_NODE(&osd->o_node);
 576         INIT_LIST_HEAD(&osd->o_requests);
 577         INIT_LIST_HEAD(&osd->o_linger_requests);
 578         INIT_LIST_HEAD(&osd->o_osd_lru);
 579         osd->o_incarnation = 1;
 580
 581         ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
 582
 583         INIT_LIST_HEAD(&osd->o_keepalive_item);
 584         return osd;
 585 }
 586
 587 static struct ceph_osd *get_osd(struct ceph_osd *osd)
 588 {
 589         if (atomic_inc_not_zero(&osd->o_ref)) {
 590                 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
 591                      atomic_read(&osd->o_ref));
 592                 return osd;
 593         } else {
 594                 dout("get_osd %p FAIL\n", osd);
 595                 return NULL;
 596         }
 597 }
 598
 599 static void put_osd(struct ceph_osd *osd)
 600 {
 601         dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
 602              atomic_read(&osd->o_ref) - 1);
 603         if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
 604                 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
 605
 606                 if (ac->ops && ac->ops->destroy_authorizer)
 607                         ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
 608                 kfree(osd);
 609         }
 610 }
 611
 612 /*
 613  * remove an osd from our map
 614  */
 615 static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 616 {
 617         dout("__remove_osd %p\n", osd);
 618         BUG_ON(!list_empty(&osd->o_requests));
 619         rb_erase(&osd->o_node, &osdc->osds);
 620         list_del_init(&osd->o_osd_lru);
 621         ceph_con_close(&osd->o_con);
 622         put_osd(osd);
 623 }
 624
 625 static void remove_all_osds(struct ceph_osd_client *osdc)
 626 {
 627         dout("%s %p\n", __func__, osdc);
 628         mutex_lock(&osdc->request_mutex);
 629         while (!RB_EMPTY_ROOT(&osdc->osds)) {
 630                 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
 631                                                 struct ceph_osd, o_node);
 632                 __remove_osd(osdc, osd);
 633         }
 634         mutex_unlock(&osdc->request_mutex);
 635 }
 636
 637 static void __move_osd_to_lru(struct ceph_osd_client *osdc,
 638                               struct ceph_osd *osd)
 639 {
 640         dout("__move_osd_to_lru %p\n", osd);
 641         BUG_ON(!list_empty(&osd->o_osd_lru));
 642         list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
 643         osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
 644 }
 645
 646 static void __remove_osd_from_lru(struct ceph_osd *osd)
 647 {
 648         dout("__remove_osd_from_lru %p\n", osd);
 649         if (!list_empty(&osd->o_osd_lru))
 650                 list_del_init(&osd->o_osd_lru);
 651 }
 652
 653 static void remove_old_osds(struct ceph_osd_client *osdc)
 654 {
 655         struct ceph_osd *osd, *nosd;
 656
 657         dout("__remove_old_osds %p\n", osdc);
 658         mutex_lock(&osdc->request_mutex);
 659         list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
 660                 if (time_before(jiffies, osd->lru_ttl))
 661                         break;
 662                 __remove_osd(osdc, osd);
 663         }
 664         mutex_unlock(&osdc->request_mutex);
 665 }
 666
 667 /*
 668  * reset osd connect
 669  */
 670 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 671 {
 672         struct ceph_entity_addr *peer_addr;
 673
 674         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 675         if (list_empty(&osd->o_requests) &&
 676             list_empty(&osd->o_linger_requests)) {
 677                 __remove_osd(osdc, osd);
 678
 679                 return -ENODEV;
 680         }
 681
 682         peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
 683         if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
 684                         !ceph_con_opened(&osd->o_con)) {
 685                 struct ceph_osd_request *req;
 686
 687                 dout(" osd addr hasn't changed and connection never opened,"
 688                      " letting msgr retry");
 689                 /* touch each r_stamp for handle_timeout()'s benfit */
 690                 list_for_each_entry(req, &osd->o_requests, r_osd_item)
 691                         req->r_stamp = jiffies;
 692
 693                 return -EAGAIN;
 694         }
 695
 696         ceph_con_close(&osd->o_con);
 697         ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
 698         osd->o_incarnation++;
 699
 700         return 0;
 701 }
 702
 703 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
 704 {
 705         struct rb_node **p = &osdc->osds.rb_node;
 706         struct rb_node *parent = NULL;
 707         struct ceph_osd *osd = NULL;
 708
 709         dout("__insert_osd %p osd%d\n", new, new->o_osd);
 710         while (*p) {
 711                 parent = *p;
 712                 osd = rb_entry(parent, struct ceph_osd, o_node);
 713                 if (new->o_osd < osd->o_osd)
 714                         p = &(*p)->rb_left;
 715                 else if (new->o_osd > osd->o_osd)
 716                         p = &(*p)->rb_right;
 717                 else
 718                         BUG();
 719         }
 720
 721         rb_link_node(&new->o_node, parent, p);
 722         rb_insert_color(&new->o_node, &osdc->osds);
 723 }
 724
 725 static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
 726 {
 727         struct ceph_osd *osd;
 728         struct rb_node *n = osdc->osds.rb_node;
 729
 730         while (n) {
 731                 osd = rb_entry(n, struct ceph_osd, o_node);
 732                 if (o < osd->o_osd)
 733                         n = n->rb_left;
 734                 else if (o > osd->o_osd)
 735                         n = n->rb_right;
 736                 else
 737                         return osd;
 738         }
 739         return NULL;
 740 }
 741
 742 static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
 743 {
 744         schedule_delayed_work(&osdc->timeout_work,
 745                         osdc->client->options->osd_keepalive_timeout * HZ);
 746 }
 747
 748 static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
 749 {
 750         cancel_delayed_work(&osdc->timeout_work);
 751 }
 752
 753 /*
 754  * Register request, assign tid.  If this is the first request, set up
 755  * the timeout event.
 756  */
 757 static void __register_request(struct ceph_osd_client *osdc,
 758                                struct ceph_osd_request *req)
 759 {
 760         req->r_tid = ++osdc->last_tid;
 761         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
 762         dout("__register_request %p tid %lld\n", req, req->r_tid);
 763         __insert_request(osdc, req);
 764         ceph_osdc_get_request(req);
 765         osdc->num_requests++;
 766         if (osdc->num_requests == 1) {
 767                 dout(" first request, scheduling timeout\n");
 768                 __schedule_osd_timeout(osdc);
 769         }
 770 }
 771
 772 static void register_request(struct ceph_osd_client *osdc,
 773                              struct ceph_osd_request *req)
 774 {
 775         mutex_lock(&osdc->request_mutex);
 776         __register_request(osdc, req);
 777         mutex_unlock(&osdc->request_mutex);
 778 }
 779
 780 /*
 781  * called under osdc->request_mutex
 782  */
 783 static void __unregister_request(struct ceph_osd_client *osdc,
 784                                  struct ceph_osd_request *req)
 785 {
 786         if (RB_EMPTY_NODE(&req->r_node)) {
 787                 dout("__unregister_request %p tid %lld not registered\n",
 788                         req, req->r_tid);
 789                 return;
 790         }
 791
 792         dout("__unregister_request %p tid %lld\n", req, req->r_tid);
 793         rb_erase(&req->r_node, &osdc->requests);
 794         osdc->num_requests--;
 795
 796         if (req->r_osd) {
 797                 /* make sure the original request isn't in flight. */
 798                 ceph_msg_revoke(req->r_request);
 799
 800                 list_del_init(&req->r_osd_item);
 801                 if (list_empty(&req->r_osd->o_requests) &&
 802                     list_empty(&req->r_osd->o_linger_requests)) {
 803                         dout("moving osd to %p lru\n", req->r_osd);
 804                         __move_osd_to_lru(osdc, req->r_osd);
 805                 }
 806                 if (list_empty(&req->r_linger_item))
 807                         req->r_osd = NULL;
 808         }
 809
 810         list_del_init(&req->r_req_lru_item);
 811         ceph_osdc_put_request(req);
 812
 813         if (osdc->num_requests == 0) {
 814                 dout(" no requests, canceling timeout\n");
 815                 __cancel_osd_timeout(osdc);
 816         }
 817 }
 818
 819 /*
 820  * Cancel a previously queued request message
 821  */
 822 static void __cancel_request(struct ceph_osd_request *req)
 823 {
 824         if (req->r_sent && req->r_osd) {
 825                 ceph_msg_revoke(req->r_request);
 826                 req->r_sent = 0;
 827         }
 828 }
 829
 830 static void __register_linger_request(struct ceph_osd_client *osdc,
 831                                     struct ceph_osd_request *req)
 832 {
 833         dout("__register_linger_request %p\n", req);
 834         list_add_tail(&req->r_linger_item, &osdc->req_linger);
 835         if (req->r_osd)
 836                 list_add_tail(&req->r_linger_osd,
 837                               &req->r_osd->o_linger_requests);
 838 }
 839
 840 static void __unregister_linger_request(struct ceph_osd_client *osdc,
 841                                         struct ceph_osd_request *req)
 842 {
 843         dout("__unregister_linger_request %p\n", req);
 844         list_del_init(&req->r_linger_item);
 845         if (req->r_osd) {
 846                 list_del_init(&req->r_linger_osd);
 847
 848                 if (list_empty(&req->r_osd->o_requests) &&
 849                     list_empty(&req->r_osd->o_linger_requests)) {
 850                         dout("moving osd to %p lru\n", req->r_osd);
 851                         __move_osd_to_lru(osdc, req->r_osd);
 852                 }
 853                 if (list_empty(&req->r_osd_item))
 854                         req->r_osd = NULL;
 855         }
 856 }
 857
 858 void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 859                                          struct ceph_osd_request *req)
 860 {
 861         mutex_lock(&osdc->request_mutex);
 862         if (req->r_linger) {
 863                 __unregister_linger_request(osdc, req);
 864                 ceph_osdc_put_request(req);
 865         }
 866         mutex_unlock(&osdc->request_mutex);
 867 }
 868 EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
 869
 870 void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 871                                   struct ceph_osd_request *req)
 872 {
 873         if (!req->r_linger) {
 874                 dout("set_request_linger %p\n", req);
 875                 req->r_linger = 1;
 876                 /*
 877                  * caller is now responsible for calling
 878                  * unregister_linger_request
 879                  */
 880                 ceph_osdc_get_request(req);
 881         }
 882 }
 883 EXPORT_SYMBOL(ceph_osdc_set_request_linger);
 884
 885 /*
 886  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
 887  * (as needed), and set the request r_osd appropriately.  If there is
 888  * no up osd, set r_osd to NULL.  Move the request to the appropriate list
 889  * (unsent, homeless) or leave on in-flight lru.
 890  *
 891  * Return 0 if unchanged, 1 if changed, or negative on error.
 892  *
 893  * Caller should hold map_sem for read and request_mutex.
 894  */
 895 static int __map_request(struct ceph_osd_client *osdc,
 896                          struct ceph_osd_request *req, int force_resend)
 897 {
 898         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 899         struct ceph_pg pgid;
 900         int acting[CEPH_PG_MAX_SIZE];
 901         int o = -1, num = 0;
 902         int err;
 903
 904         dout("map_request %p tid %lld\n", req, req->r_tid);
 905         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
 906                                       &req->r_file_layout, osdc->osdmap);
 907         if (err) {
 908                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 909                 return err;
 910         }
 911         pgid = reqhead->layout.ol_pgid;
 912         req->r_pgid = pgid;
 913
 914         err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
 915         if (err > 0) {
 916                 o = acting[0];
 917                 num = err;
 918         }
 919
 920         if ((!force_resend &&
 921              req->r_osd && req->r_osd->o_osd == o &&
 922              req->r_sent >= req->r_osd->o_incarnation &&
 923              req->r_num_pg_osds == num &&
 924              memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
 925             (req->r_osd == NULL && o == -1))
 926                 return 0;  /* no change */
 927
 928         dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
 929              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
 930              req->r_osd ? req->r_osd->o_osd : -1);
 931
 932         /* record full pg acting set */
 933         memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
 934         req->r_num_pg_osds = num;
 935
 936         if (req->r_osd) {
 937                 __cancel_request(req);
 938                 list_del_init(&req->r_osd_item);
 939                 req->r_osd = NULL;
 940         }
 941
 942         req->r_osd = __lookup_osd(osdc, o);
 943         if (!req->r_osd && o >= 0) {
 944                 err = -ENOMEM;
 945                 req->r_osd = create_osd(osdc, o);
 946                 if (!req->r_osd) {
 947                         list_move(&req->r_req_lru_item, &osdc->req_notarget);
 948                         goto out;
 949                 }
 950
 951                 dout("map_request osd %p is osd%d\n", req->r_osd, o);
 952                 __insert_osd(osdc, req->r_osd);
 953
 954                 ceph_con_open(&req->r_osd->o_con,
 955                               CEPH_ENTITY_TYPE_OSD, o,
 956                               &osdc->osdmap->osd_addr[o]);
 957         }
 958
 959         if (req->r_osd) {
 960                 __remove_osd_from_lru(req->r_osd);
 961                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
 962                 list_move(&req->r_req_lru_item, &osdc->req_unsent);
 963         } else {
 964                 list_move(&req->r_req_lru_item, &osdc->req_notarget);
 965         }
 966         err = 1;   /* osd or pg changed */
 967
 968 out:
 969         return err;
 970 }
 971
 972 /*
 973  * caller should hold map_sem (for read) and request_mutex
 974  */
 975 static void __send_request(struct ceph_osd_client *osdc,
 976                            struct ceph_osd_request *req)
 977 {
 978         struct ceph_osd_request_head *reqhead;
 979
 980         dout("send_request %p tid %llu to osd%d flags %d\n",
 981              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
 982
 983         reqhead = req->r_request->front.iov_base;
 984         reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
 985         reqhead->flags |= cpu_to_le32(req->r_flags);  /* e.g., RETRY */
 986         reqhead->reassert_version = req->r_reassert_version;
 987
 988         req->r_stamp = jiffies;
 989         list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
 990
 991         ceph_msg_get(req->r_request); /* send consumes a ref */
 992         ceph_con_send(&req->r_osd->o_con, req->r_request);
 993         req->r_sent = req->r_osd->o_incarnation;
 994 }
 995
 996 /*
 997  * Send any requests in the queue (req_unsent).
 998  */
 999 static void send_queued(struct ceph_osd_client *osdc)
1000 {
1001         struct ceph_osd_request *req, *tmp;
1002
1003         dout("send_queued\n");
1004         mutex_lock(&osdc->request_mutex);
1005         list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1006                 __send_request(osdc, req);
1007         }
1008         mutex_unlock(&osdc->request_mutex);
1009 }
1010
1011 /*
1012  * Timeout callback, called every N seconds when 1 or more osd
1013  * requests has been active for more than N seconds.  When this
1014  * happens, we ping all OSDs with requests who have timed out to
1015  * ensure any communications channel reset is detected.  Reset the
1016  * request timeouts another N seconds in the future as we go.
1017  * Reschedule the timeout event another N seconds in future (unless
1018  * there are no open requests).
1019  */
1020 static void handle_timeout(struct work_struct *work)
1021 {
1022         struct ceph_osd_client *osdc =
1023                 container_of(work, struct ceph_osd_client, timeout_work.work);
1024         struct ceph_osd_request *req;
1025         struct ceph_osd *osd;
1026         unsigned long keepalive =
1027                 osdc->client->options->osd_keepalive_timeout * HZ;
1028         struct list_head slow_osds;
1029         dout("timeout\n");
1030         down_read(&osdc->map_sem);
1031
1032         ceph_monc_request_next_osdmap(&osdc->client->monc);
1033
1034         mutex_lock(&osdc->request_mutex);
1035
1036         /*
1037          * ping osds that are a bit slow.  this ensures that if there
1038          * is a break in the TCP connection we will notice, and reopen
1039          * a connection with that osd (from the fault callback).
1040          */
1041         INIT_LIST_HEAD(&slow_osds);
1042         list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
1043                 if (time_before(jiffies, req->r_stamp + keepalive))
1044                         break;
1045
1046                 osd = req->r_osd;
1047                 BUG_ON(!osd);
1048                 dout(" tid %llu is slow, will send keepalive on osd%d\n",
1049                      req->r_tid, osd->o_osd);
1050                 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1051         }
1052         while (!list_empty(&slow_osds)) {
1053                 osd = list_entry(slow_osds.next, struct ceph_osd,
1054                                  o_keepalive_item);
1055                 list_del_init(&osd->o_keepalive_item);
1056                 ceph_con_keepalive(&osd->o_con);
1057         }
1058
1059         __schedule_osd_timeout(osdc);
1060         mutex_unlock(&osdc->request_mutex);
1061         send_queued(osdc);
1062         up_read(&osdc->map_sem);
1063 }
1064
1065 static void handle_osds_timeout(struct work_struct *work)
1066 {
1067         struct ceph_osd_client *osdc =
1068                 container_of(work, struct ceph_osd_client,
1069                              osds_timeout_work.work);
1070         unsigned long delay =
1071                 osdc->client->options->osd_idle_ttl * HZ >> 2;
1072
1073         dout("osds timeout\n");
1074         down_read(&osdc->map_sem);
1075         remove_old_osds(osdc);
1076         up_read(&osdc->map_sem);
1077
1078         schedule_delayed_work(&osdc->osds_timeout_work,
1079                               round_jiffies_relative(delay));
1080 }
1081
1082 static void complete_request(struct ceph_osd_request *req)
1083 {
1084         if (req->r_safe_callback)
1085                 req->r_safe_callback(req, NULL);
1086         complete_all(&req->r_safe_completion);  /* fsync waiter */
1087 }
1088
1089 /*
1090  * handle osd op reply.  either call the callback if it is specified,
1091  * or do the completion to wake up the waiting thread.
1092  */
1093 static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1094                          struct ceph_connection *con)
1095 {
1096         struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1097         struct ceph_osd_request *req;
1098         u64 tid;
1099         int numops, object_len, flags;
1100         s32 result;
1101
1102         tid = le64_to_cpu(msg->hdr.tid);
1103         if (msg->front.iov_len < sizeof(*rhead))
1104                 goto bad;
1105         numops = le32_to_cpu(rhead->num_ops);
1106         object_len = le32_to_cpu(rhead->object_len);
1107         result = le32_to_cpu(rhead->result);
1108         if (msg->front.iov_len != sizeof(*rhead) + object_len +
1109             numops * sizeof(struct ceph_osd_op))
1110                 goto bad;
1111         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
1112         /* lookup */
1113         mutex_lock(&osdc->request_mutex);
1114         req = __lookup_request(osdc, tid);
1115         if (req == NULL) {
1116                 dout("handle_reply tid %llu dne\n", tid);
1117                 mutex_unlock(&osdc->request_mutex);
1118                 return;
1119         }
1120         ceph_osdc_get_request(req);
1121         flags = le32_to_cpu(rhead->flags);
1122
1123         /*
1124          * if this connection filled our message, drop our reference now, to
1125          * avoid a (safe but slower) revoke later.
1126          */
1127         if (req->r_con_filling_msg == con && req->r_reply == msg) {
1128                 dout(" dropping con_filling_msg ref %p\n", con);
1129                 req->r_con_filling_msg = NULL;
1130                 con->ops->put(con);
1131         }
1132
1133         if (!req->r_got_reply) {
1134                 unsigned int bytes;
1135
1136                 req->r_result = le32_to_cpu(rhead->result);
1137                 bytes = le32_to_cpu(msg->hdr.data_len);
1138                 dout("handle_reply result %d bytes %d\n", req->r_result,
1139                      bytes);
1140                 if (req->r_result == 0)
1141                         req->r_result = bytes;
1142
1143                 /* in case this is a write and we need to replay, */
1144                 req->r_reassert_version = rhead->reassert_version;
1145
1146                 req->r_got_reply = 1;
1147         } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1148                 dout("handle_reply tid %llu dup ack\n", tid);
1149                 mutex_unlock(&osdc->request_mutex);
1150                 goto done;
1151         }
1152
1153         dout("handle_reply tid %llu flags %d\n", tid, flags);
1154
1155         if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1156                 __register_linger_request(osdc, req);
1157
1158         /* either this is a read, or we got the safe response */
1159         if (result < 0 ||
1160             (flags & CEPH_OSD_FLAG_ONDISK) ||
1161             ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1162                 __unregister_request(osdc, req);
1163
1164         mutex_unlock(&osdc->request_mutex);
1165
1166         if (req->r_callback)
1167                 req->r_callback(req, msg);
1168         else
1169                 complete_all(&req->r_completion);
1170
1171         if (flags & CEPH_OSD_FLAG_ONDISK)
1172                 complete_request(req);
1173
1174 done:
1175         dout("req=%p req->r_linger=%d\n", req, req->r_linger);
1176         ceph_osdc_put_request(req);
1177         return;
1178
1179 bad:
1180         pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1181                (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1182                (int)sizeof(*rhead));
1183         ceph_msg_dump(msg);
1184 }
1185
1186 static void reset_changed_osds(struct ceph_osd_client *osdc)
1187 {
1188         struct rb_node *p, *n;
1189
1190         for (p = rb_first(&osdc->osds); p; p = n) {
1191                 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
1192
1193                 n = rb_next(p);
1194                 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1195                     memcmp(&osd->o_con.peer_addr,
1196                            ceph_osd_addr(osdc->osdmap,
1197                                          osd->o_osd),
1198                            sizeof(struct ceph_entity_addr)) != 0)
1199                         __reset_osd(osdc, osd);
1200         }
1201 }
1202
1203 /*
1204  * Requeue requests whose mapping to an OSD has changed.  If requests map to
1205  * no osd, request a new map.
1206  *
1207  * Caller should hold map_sem for read.
1208  */
1209 static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
1210 {
1211         struct ceph_osd_request *req, *nreq;
1212         struct rb_node *p;
1213         int needmap = 0;
1214         int err;
1215
1216         dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
1217         mutex_lock(&osdc->request_mutex);
1218         for (p = rb_first(&osdc->requests); p; ) {
1219                 req = rb_entry(p, struct ceph_osd_request, r_node);
1220                 p = rb_next(p);
1221
1222                 /*
1223                  * For linger requests that have not yet been
1224                  * registered, move them to the linger list; they'll
1225                  * be sent to the osd in the loop below.  Unregister
1226                  * the request before re-registering it as a linger
1227                  * request to ensure the __map_request() below
1228                  * will decide it needs to be sent.
1229                  */
1230                 if (req->r_linger && list_empty(&req->r_linger_item)) {
1231                         dout("%p tid %llu restart on osd%d\n",
1232                              req, req->r_tid,
1233                              req->r_osd ? req->r_osd->o_osd : -1);
1234                         __unregister_request(osdc, req);
1235                         __register_linger_request(osdc, req);
1236                         continue;
1237                 }
1238
1239                 err = __map_request(osdc, req, force_resend);
1240                 if (err < 0)
1241                         continue;  /* error */
1242                 if (req->r_osd == NULL) {
1243                         dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1244                         needmap++;  /* request a newer map */
1245                 } else if (err > 0) {
1246                         if (!req->r_linger) {
1247                                 dout("%p tid %llu requeued on osd%d\n", req,
1248                                      req->r_tid,
1249                                      req->r_osd ? req->r_osd->o_osd : -1);
1250                                 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1251                         }
1252                 }
1253         }
1254
1255         list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1256                                  r_linger_item) {
1257                 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1258
1259                 err = __map_request(osdc, req, force_resend);
1260                 dout("__map_request returned %d\n", err);
1261                 if (err == 0)
1262                         continue;  /* no change and no osd was specified */
1263                 if (err < 0)
1264                         continue;  /* hrm! */
1265                 if (req->r_osd == NULL) {
1266                         dout("tid %llu maps to no valid osd\n", req->r_tid);
1267                         needmap++;  /* request a newer map */
1268                         continue;
1269                 }
1270
1271                 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1272                      req->r_osd ? req->r_osd->o_osd : -1);
1273                 __register_request(osdc, req);
1274                 __unregister_linger_request(osdc, req);
1275         }
1276         mutex_unlock(&osdc->request_mutex);
1277
1278         if (needmap) {
1279                 dout("%d requests for down osds, need new map\n", needmap);
1280                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1281         }
1282         reset_changed_osds(osdc);
1283 }
1284
1285
1286 /*
1287  * Process updated osd map.
1288  *
1289  * The message contains any number of incremental and full maps, normally
1290  * indicating some sort of topology change in the cluster.  Kick requests
1291  * off to different OSDs as needed.
1292  */
1293 void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1294 {
1295         void *p, *end, *next;
1296         u32 nr_maps, maplen;
1297         u32 epoch;
1298         struct ceph_osdmap *newmap = NULL, *oldmap;
1299         int err;
1300         struct ceph_fsid fsid;
1301
1302         dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1303         p = msg->front.iov_base;
1304         end = p + msg->front.iov_len;
1305
1306         /* verify fsid */
1307         ceph_decode_need(&p, end, sizeof(fsid), bad);
1308         ceph_decode_copy(&p, &fsid, sizeof(fsid));
1309         if (ceph_check_fsid(osdc->client, &fsid) < 0)
1310                 return;
1311
1312         down_write(&osdc->map_sem);
1313
1314         /* incremental maps */
1315         ceph_decode_32_safe(&p, end, nr_maps, bad);
1316         dout(" %d inc maps\n", nr_maps);
1317         while (nr_maps > 0) {
1318                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1319                 epoch = ceph_decode_32(&p);
1320                 maplen = ceph_decode_32(&p);
1321                 ceph_decode_need(&p, end, maplen, bad);
1322                 next = p + maplen;
1323                 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1324                         dout("applying incremental map %u len %d\n",
1325                              epoch, maplen);
1326                         newmap = osdmap_apply_incremental(&p, next,
1327                                                           osdc->osdmap,
1328                                                           &osdc->client->msgr);
1329                         if (IS_ERR(newmap)) {
1330                                 err = PTR_ERR(newmap);
1331                                 goto bad;
1332                         }
1333                         BUG_ON(!newmap);
1334                         if (newmap != osdc->osdmap) {
1335                                 ceph_osdmap_destroy(osdc->osdmap);
1336                                 osdc->osdmap = newmap;
1337                         }
1338                         kick_requests(osdc, 0);
1339                 } else {
1340                         dout("ignoring incremental map %u len %d\n",
1341                              epoch, maplen);
1342                 }
1343                 p = next;
1344                 nr_maps--;
1345         }
1346         if (newmap)
1347                 goto done;
1348
1349         /* full maps */
1350         ceph_decode_32_safe(&p, end, nr_maps, bad);
1351         dout(" %d full maps\n", nr_maps);
1352         while (nr_maps) {
1353                 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
1354                 epoch = ceph_decode_32(&p);
1355                 maplen = ceph_decode_32(&p);
1356                 ceph_decode_need(&p, end, maplen, bad);
1357                 if (nr_maps > 1) {
1358                         dout("skipping non-latest full map %u len %d\n",
1359                              epoch, maplen);
1360                 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1361                         dout("skipping full map %u len %d, "
1362                              "older than our %u\n", epoch, maplen,
1363                              osdc->osdmap->epoch);
1364                 } else {
1365                         int skipped_map = 0;
1366
1367                         dout("taking full map %u len %d\n", epoch, maplen);
1368                         newmap = osdmap_decode(&p, p+maplen);
1369                         if (IS_ERR(newmap)) {
1370                                 err = PTR_ERR(newmap);
1371                                 goto bad;
1372                         }
1373                         BUG_ON(!newmap);
1374                         oldmap = osdc->osdmap;
1375                         osdc->osdmap = newmap;
1376                         if (oldmap) {
1377                                 if (oldmap->epoch + 1 < newmap->epoch)
1378                                         skipped_map = 1;
1379                                 ceph_osdmap_destroy(oldmap);
1380                         }
1381                         kick_requests(osdc, skipped_map);
1382                 }
1383                 p += maplen;
1384                 nr_maps--;
1385         }
1386
1387 done:
1388         downgrade_write(&osdc->map_sem);
1389         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
1390
1391         /*
1392          * subscribe to subsequent osdmap updates if full to ensure
1393          * we find out when we are no longer full and stop returning
1394          * ENOSPC.
1395          */
1396         if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1397                 ceph_monc_request_next_osdmap(&osdc->client->monc);
1398
1399         send_queued(osdc);
1400         up_read(&osdc->map_sem);
1401         wake_up_all(&osdc->client->auth_wq);
1402         return;
1403
1404 bad:
1405         pr_err("osdc handle_map corrupt msg\n");
1406         ceph_msg_dump(msg);
1407         up_write(&osdc->map_sem);
1408         return;
1409 }
1410
1411 /*
1412  * watch/notify callback event infrastructure
1413  *
1414  * These callbacks are used both for watch and notify operations.
1415  */
1416 static void __release_event(struct kref *kref)
1417 {
1418         struct ceph_osd_event *event =
1419                 container_of(kref, struct ceph_osd_event, kref);
1420
1421         dout("__release_event %p\n", event);
1422         kfree(event);
1423 }
1424
1425 static void get_event(struct ceph_osd_event *event)
1426 {
1427         kref_get(&event->kref);
1428 }
1429
1430 void ceph_osdc_put_event(struct ceph_osd_event *event)
1431 {
1432         kref_put(&event->kref, __release_event);
1433 }
1434 EXPORT_SYMBOL(ceph_osdc_put_event);
1435
1436 static void __insert_event(struct ceph_osd_client *osdc,
1437                              struct ceph_osd_event *new)
1438 {
1439         struct rb_node **p = &osdc->event_tree.rb_node;
1440         struct rb_node *parent = NULL;
1441         struct ceph_osd_event *event = NULL;
1442
1443         while (*p) {
1444                 parent = *p;
1445                 event = rb_entry(parent, struct ceph_osd_event, node);
1446                 if (new->cookie < event->cookie)
1447                         p = &(*p)->rb_left;
1448                 else if (new->cookie > event->cookie)
1449                         p = &(*p)->rb_right;
1450                 else
1451                         BUG();
1452         }
1453
1454         rb_link_node(&new->node, parent, p);
1455         rb_insert_color(&new->node, &osdc->event_tree);
1456 }
1457
1458 static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1459                                                 u64 cookie)
1460 {
1461         struct rb_node **p = &osdc->event_tree.rb_node;
1462         struct rb_node *parent = NULL;
1463         struct ceph_osd_event *event = NULL;
1464
1465         while (*p) {
1466                 parent = *p;
1467                 event = rb_entry(parent, struct ceph_osd_event, node);
1468                 if (cookie < event->cookie)
1469                         p = &(*p)->rb_left;
1470                 else if (cookie > event->cookie)
1471                         p = &(*p)->rb_right;
1472                 else
1473                         return event;
1474         }
1475         return NULL;
1476 }
1477
1478 static void __remove_event(struct ceph_osd_event *event)
1479 {
1480         struct ceph_osd_client *osdc = event->osdc;
1481
1482         if (!RB_EMPTY_NODE(&event->node)) {
1483                 dout("__remove_event removed %p\n", event);
1484                 rb_erase(&event->node, &osdc->event_tree);
1485                 ceph_osdc_put_event(event);
1486         } else {
1487                 dout("__remove_event didn't remove %p\n", event);
1488         }
1489 }
1490
1491 int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1492                            void (*event_cb)(u64, u64, u8, void *),
1493                            int one_shot, void *data,
1494                            struct ceph_osd_event **pevent)
1495 {
1496         struct ceph_osd_event *event;
1497
1498         event = kmalloc(sizeof(*event), GFP_NOIO);
1499         if (!event)
1500                 return -ENOMEM;
1501
1502         dout("create_event %p\n", event);
1503         event->cb = event_cb;
1504         event->one_shot = one_shot;
1505         event->data = data;
1506         event->osdc = osdc;
1507         INIT_LIST_HEAD(&event->osd_node);
1508         RB_CLEAR_NODE(&event->node);
1509         kref_init(&event->kref);   /* one ref for us */
1510         kref_get(&event->kref);    /* one ref for the caller */
1511         init_completion(&event->completion);
1512
1513         spin_lock(&osdc->event_lock);
1514         event->cookie = ++osdc->event_count;
1515         __insert_event(osdc, event);
1516         spin_unlock(&osdc->event_lock);
1517
1518         *pevent = event;
1519         return 0;
1520 }
1521 EXPORT_SYMBOL(ceph_osdc_create_event);
1522
1523 void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1524 {
1525         struct ceph_osd_client *osdc = event->osdc;
1526
1527         dout("cancel_event %p\n", event);
1528         spin_lock(&osdc->event_lock);
1529         __remove_event(event);
1530         spin_unlock(&osdc->event_lock);
1531         ceph_osdc_put_event(event); /* caller's */
1532 }
1533 EXPORT_SYMBOL(ceph_osdc_cancel_event);
1534
1535
1536 static void do_event_work(struct work_struct *work)
1537 {
1538         struct ceph_osd_event_work *event_work =
1539                 container_of(work, struct ceph_osd_event_work, work);
1540         struct ceph_osd_event *event = event_work->event;
1541         u64 ver = event_work->ver;
1542         u64 notify_id = event_work->notify_id;
1543         u8 opcode = event_work->opcode;
1544
1545         dout("do_event_work completing %p\n", event);
1546         event->cb(ver, notify_id, opcode, event->data);
1547         complete(&event->completion);
1548         dout("do_event_work completed %p\n", event);
1549         ceph_osdc_put_event(event);
1550         kfree(event_work);
1551 }
1552
1553
1554 /*
1555  * Process osd watch notifications
1556  */
1557 void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1558 {
1559         void *p, *end;
1560         u8 proto_ver;
1561         u64 cookie, ver, notify_id;
1562         u8 opcode;
1563         struct ceph_osd_event *event;
1564         struct ceph_osd_event_work *event_work;
1565
1566         p = msg->front.iov_base;
1567         end = p + msg->front.iov_len;
1568
1569         ceph_decode_8_safe(&p, end, proto_ver, bad);
1570         ceph_decode_8_safe(&p, end, opcode, bad);
1571         ceph_decode_64_safe(&p, end, cookie, bad);
1572         ceph_decode_64_safe(&p, end, ver, bad);
1573         ceph_decode_64_safe(&p, end, notify_id, bad);
1574
1575         spin_lock(&osdc->event_lock);
1576         event = __find_event(osdc, cookie);
1577         if (event) {
1578                 get_event(event);
1579                 if (event->one_shot)
1580                         __remove_event(event);
1581         }
1582         spin_unlock(&osdc->event_lock);
1583         dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1584              cookie, ver, event);
1585         if (event) {
1586                 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
1587                 if (!event_work) {
1588                         dout("ERROR: could not allocate event_work\n");
1589                         goto done_err;
1590                 }
1591                 INIT_WORK(&event_work->work, do_event_work);
1592                 event_work->event = event;
1593                 event_work->ver = ver;
1594                 event_work->notify_id = notify_id;
1595                 event_work->opcode = opcode;
1596                 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1597                         dout("WARNING: failed to queue notify event work\n");
1598                         goto done_err;
1599                 }
1600         }
1601
1602         return;
1603
1604 done_err:
1605         complete(&event->completion);
1606         ceph_osdc_put_event(event);
1607         return;
1608
1609 bad:
1610         pr_err("osdc handle_watch_notify corrupt msg\n");
1611         return;
1612 }
1613
1614 int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1615 {
1616         int err;
1617
1618         dout("wait_event %p\n", event);
1619         err = wait_for_completion_interruptible_timeout(&event->completion,
1620                                                         timeout * HZ);
1621         ceph_osdc_put_event(event);
1622         if (err > 0)
1623                 err = 0;
1624         dout("wait_event %p returns %d\n", event, err);
1625         return err;
1626 }
1627 EXPORT_SYMBOL(ceph_osdc_wait_event);
1628
1629 /*
1630  * Register request, send initial attempt.
1631  */
1632 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1633                             struct ceph_osd_request *req,
1634                             bool nofail)
1635 {
1636         int rc = 0;
1637
1638         req->r_request->pages = req->r_pages;
1639         req->r_request->nr_pages = req->r_num_pages;
1640 #ifdef CONFIG_BLOCK
1641         req->r_request->bio = req->r_bio;
1642 #endif
1643         req->r_request->trail = &req->r_trail;
1644
1645         register_request(osdc, req);
1646
1647         down_read(&osdc->map_sem);
1648         mutex_lock(&osdc->request_mutex);
1649         /*
1650          * a racing kick_requests() may have sent the message for us
1651          * while we dropped request_mutex above, so only send now if
1652          * the request still han't been touched yet.
1653          */
1654         if (req->r_sent == 0) {
1655                 rc = __map_request(osdc, req, 0);
1656                 if (rc < 0) {
1657                         if (nofail) {
1658                                 dout("osdc_start_request failed map, "
1659                                      " will retry %lld\n", req->r_tid);
1660                                 rc = 0;
1661                         }
1662                         goto out_unlock;
1663                 }
1664                 if (req->r_osd == NULL) {
1665                         dout("send_request %p no up osds in pg\n", req);
1666                         ceph_monc_request_next_osdmap(&osdc->client->monc);
1667                 } else {
1668                         __send_request(osdc, req);
1669                 }
1670                 rc = 0;
1671         }
1672
1673 out_unlock:
1674         mutex_unlock(&osdc->request_mutex);
1675         up_read(&osdc->map_sem);
1676         return rc;
1677 }
1678 EXPORT_SYMBOL(ceph_osdc_start_request);
1679
1680 /*
1681  * wait for a request to complete
1682  */
1683 int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1684                            struct ceph_osd_request *req)
1685 {
1686         int rc;
1687
1688         rc = wait_for_completion_interruptible(&req->r_completion);
1689         if (rc < 0) {
1690                 mutex_lock(&osdc->request_mutex);
1691                 __cancel_request(req);
1692                 __unregister_request(osdc, req);
1693                 mutex_unlock(&osdc->request_mutex);
1694                 complete_request(req);
1695                 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
1696                 return rc;
1697         }
1698
1699         dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1700         return req->r_result;
1701 }
1702 EXPORT_SYMBOL(ceph_osdc_wait_request);
1703
1704 /*
1705  * sync - wait for all in-flight requests to flush.  avoid starvation.
1706  */
1707 void ceph_osdc_sync(struct ceph_osd_client *osdc)
1708 {
1709         struct ceph_osd_request *req;
1710         u64 last_tid, next_tid = 0;
1711
1712         mutex_lock(&osdc->request_mutex);
1713         last_tid = osdc->last_tid;
1714         while (1) {
1715                 req = __lookup_request_ge(osdc, next_tid);
1716                 if (!req)
1717                         break;
1718                 if (req->r_tid > last_tid)
1719                         break;
1720
1721                 next_tid = req->r_tid + 1;
1722                 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1723                         continue;
1724
1725                 ceph_osdc_get_request(req);
1726                 mutex_unlock(&osdc->request_mutex);
1727                 dout("sync waiting on tid %llu (last is %llu)\n",
1728                      req->r_tid, last_tid);
1729                 wait_for_completion(&req->r_safe_completion);
1730                 mutex_lock(&osdc->request_mutex);
1731                 ceph_osdc_put_request(req);
1732         }
1733         mutex_unlock(&osdc->request_mutex);
1734         dout("sync done (thru tid %llu)\n", last_tid);
1735 }
1736 EXPORT_SYMBOL(ceph_osdc_sync);
1737
1738 /*
1739  * init, shutdown
1740  */
1741 int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1742 {
1743         int err;
1744
1745         dout("init\n");
1746         osdc->client = client;
1747         osdc->osdmap = NULL;
1748         init_rwsem(&osdc->map_sem);
1749         init_completion(&osdc->map_waiters);
1750         osdc->last_requested_map = 0;
1751         mutex_init(&osdc->request_mutex);
1752         osdc->last_tid = 0;
1753         osdc->osds = RB_ROOT;
1754         INIT_LIST_HEAD(&osdc->osd_lru);
1755         osdc->requests = RB_ROOT;
1756         INIT_LIST_HEAD(&osdc->req_lru);
1757         INIT_LIST_HEAD(&osdc->req_unsent);
1758         INIT_LIST_HEAD(&osdc->req_notarget);
1759         INIT_LIST_HEAD(&osdc->req_linger);
1760         osdc->num_requests = 0;
1761         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
1762         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
1763         spin_lock_init(&osdc->event_lock);
1764         osdc->event_tree = RB_ROOT;
1765         osdc->event_count = 0;
1766
1767         schedule_delayed_work(&osdc->osds_timeout_work,
1768            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
1769
1770         err = -ENOMEM;
1771         osdc->req_mempool = mempool_create_kmalloc_pool(10,
1772                                         sizeof(struct ceph_osd_request));
1773         if (!osdc->req_mempool)
1774                 goto out;
1775
1776         err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
1777                                 OSD_OP_FRONT_LEN, 10, true,
1778                                 "osd_op");
1779         if (err < 0)
1780                 goto out_mempool;
1781         err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
1782                                 OSD_OPREPLY_FRONT_LEN, 10, true,
1783                                 "osd_op_reply");
1784         if (err < 0)
1785                 goto out_msgpool;
1786
1787         osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1788         if (IS_ERR(osdc->notify_wq)) {
1789                 err = PTR_ERR(osdc->notify_wq);
1790                 osdc->notify_wq = NULL;
1791                 goto out_msgpool;
1792         }
1793         return 0;
1794
1795 out_msgpool:
1796         ceph_msgpool_destroy(&osdc->msgpool_op);
1797 out_mempool:
1798         mempool_destroy(osdc->req_mempool);
1799 out:
1800         return err;
1801 }
1802 EXPORT_SYMBOL(ceph_osdc_init);
1803
1804 void ceph_osdc_stop(struct ceph_osd_client *osdc)
1805 {
1806         flush_workqueue(osdc->notify_wq);
1807         destroy_workqueue(osdc->notify_wq);
1808         cancel_delayed_work_sync(&osdc->timeout_work);
1809         cancel_delayed_work_sync(&osdc->osds_timeout_work);
1810         if (osdc->osdmap) {
1811                 ceph_osdmap_destroy(osdc->osdmap);
1812                 osdc->osdmap = NULL;
1813         }
1814         remove_all_osds(osdc);
1815         mempool_destroy(osdc->req_mempool);
1816         ceph_msgpool_destroy(&osdc->msgpool_op);
1817         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
1818 }
1819 EXPORT_SYMBOL(ceph_osdc_stop);
1820
1821 /*
1822  * Read some contiguous pages.  If we cross a stripe boundary, shorten
1823  * *plen.  Return number of bytes read, or error.
1824  */
1825 int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1826                         struct ceph_vino vino, struct ceph_file_layout *layout,
1827                         u64 off, u64 *plen,
1828                         u32 truncate_seq, u64 truncate_size,
1829                         struct page **pages, int num_pages, int page_align)
1830 {
1831         struct ceph_osd_request *req;
1832         int rc = 0;
1833
1834         dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1835              vino.snap, off, *plen);
1836         req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1837                                     CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1838                                     NULL, 0, truncate_seq, truncate_size, NULL,
1839                                     false, 1, page_align);
1840         if (IS_ERR(req))
1841                 return PTR_ERR(req);
1842
1843         /* it may be a short read due to an object boundary */
1844         req->r_pages = pages;
1845
1846         dout("readpages  final extent is %llu~%llu (%d pages align %d)\n",
1847              off, *plen, req->r_num_pages, page_align);
1848
1849         rc = ceph_osdc_start_request(osdc, req, false);
1850         if (!rc)
1851                 rc = ceph_osdc_wait_request(osdc, req);
1852
1853         ceph_osdc_put_request(req);
1854         dout("readpages result %d\n", rc);
1855         return rc;
1856 }
1857 EXPORT_SYMBOL(ceph_osdc_readpages);
1858
1859 /*
1860  * do a synchronous write on N pages
1861  */
1862 int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1863                          struct ceph_file_layout *layout,
1864                          struct ceph_snap_context *snapc,
1865                          u64 off, u64 len,
1866                          u32 truncate_seq, u64 truncate_size,
1867                          struct timespec *mtime,
1868                          struct page **pages, int num_pages,
1869                          int flags, int do_sync, bool nofail)
1870 {
1871         struct ceph_osd_request *req;
1872         int rc = 0;
1873         int page_align = off & ~PAGE_MASK;
1874
1875         BUG_ON(vino.snap != CEPH_NOSNAP);
1876         req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1877                                     CEPH_OSD_OP_WRITE,
1878                                     flags | CEPH_OSD_FLAG_ONDISK |
1879                                             CEPH_OSD_FLAG_WRITE,
1880                                     snapc, do_sync,
1881                                     truncate_seq, truncate_size, mtime,
1882                                     nofail, 1, page_align);
1883         if (IS_ERR(req))
1884                 return PTR_ERR(req);
1885
1886         /* it may be a short write due to an object boundary */
1887         req->r_pages = pages;
1888         dout("writepages %llu~%llu (%d pages)\n", off, len,
1889              req->r_num_pages);
1890
1891         rc = ceph_osdc_start_request(osdc, req, nofail);
1892         if (!rc)
1893                 rc = ceph_osdc_wait_request(osdc, req);
1894
1895         ceph_osdc_put_request(req);
1896         if (rc == 0)
1897                 rc = len;
1898         dout("writepages result %d\n", rc);
1899         return rc;
1900 }
1901 EXPORT_SYMBOL(ceph_osdc_writepages);
1902
1903 /*
1904  * handle incoming message
1905  */
1906 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1907 {
1908         struct ceph_osd *osd = con->private;
1909         struct ceph_osd_client *osdc;
1910         int type = le16_to_cpu(msg->hdr.type);
1911
1912         if (!osd)
1913                 goto out;
1914         osdc = osd->o_osdc;
1915
1916         switch (type) {
1917         case CEPH_MSG_OSD_MAP:
1918                 ceph_osdc_handle_map(osdc, msg);
1919                 break;
1920         case CEPH_MSG_OSD_OPREPLY:
1921                 handle_reply(osdc, msg, con);
1922                 break;
1923         case CEPH_MSG_WATCH_NOTIFY:
1924                 handle_watch_notify(osdc, msg);
1925                 break;
1926
1927         default:
1928                 pr_err("received unknown message type %d %s\n", type,
1929                        ceph_msg_type_name(type));
1930         }
1931 out:
1932         ceph_msg_put(msg);
1933 }
1934
1935 /*
1936  * lookup and return message for incoming reply.  set up reply message
1937  * pages.
1938  */
1939 static struct ceph_msg *get_reply(struct ceph_connection *con,
1940                                   struct ceph_msg_header *hdr,
1941                                   int *skip)
1942 {
1943         struct ceph_osd *osd = con->private;
1944         struct ceph_osd_client *osdc = osd->o_osdc;
1945         struct ceph_msg *m;
1946         struct ceph_osd_request *req;
1947         int front = le32_to_cpu(hdr->front_len);
1948         int data_len = le32_to_cpu(hdr->data_len);
1949         u64 tid;
1950
1951         tid = le64_to_cpu(hdr->tid);
1952         mutex_lock(&osdc->request_mutex);
1953         req = __lookup_request(osdc, tid);
1954         if (!req) {
1955                 *skip = 1;
1956                 m = NULL;
1957                 dout("get_reply unknown tid %llu from osd%d\n", tid,
1958                      osd->o_osd);
1959                 goto out;
1960         }
1961
1962         if (req->r_con_filling_msg) {
1963                 dout("%s revoking msg %p from old con %p\n", __func__,
1964                      req->r_reply, req->r_con_filling_msg);
1965                 ceph_msg_revoke_incoming(req->r_reply);
1966                 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
1967                 req->r_con_filling_msg = NULL;
1968         }
1969
1970         if (front > req->r_reply->front.iov_len) {
1971                 pr_warning("get_reply front %d > preallocated %d\n",
1972                            front, (int)req->r_reply->front.iov_len);
1973                 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
1974                 if (!m)
1975                         goto out;
1976                 ceph_msg_put(req->r_reply);
1977                 req->r_reply = m;
1978         }
1979         m = ceph_msg_get(req->r_reply);
1980
1981         if (data_len > 0) {
1982                 int want = calc_pages_for(req->r_page_alignment, data_len);
1983
1984                 if (unlikely(req->r_num_pages < want)) {
1985                         pr_warning("tid %lld reply has %d bytes %d pages, we"
1986                                    " had only %d pages ready\n", tid, data_len,
1987                                    want, req->r_num_pages);
1988                         *skip = 1;
1989                         ceph_msg_put(m);
1990                         m = NULL;
1991                         goto out;
1992                 }
1993                 m->pages = req->r_pages;
1994                 m->nr_pages = req->r_num_pages;
1995                 m->page_alignment = req->r_page_alignment;
1996 #ifdef CONFIG_BLOCK
1997                 m->bio = req->r_bio;
1998 #endif
1999         }
2000         *skip = 0;
2001         req->r_con_filling_msg = con->ops->get(con);
2002         dout("get_reply tid %lld %p\n", tid, m);
2003
2004 out:
2005         mutex_unlock(&osdc->request_mutex);
2006         return m;
2007
2008 }
2009
2010 static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2011                                   struct ceph_msg_header *hdr,
2012                                   int *skip)
2013 {
2014         struct ceph_osd *osd = con->private;
2015         int type = le16_to_cpu(hdr->type);
2016         int front = le32_to_cpu(hdr->front_len);
2017
2018         *skip = 0;
2019         switch (type) {
2020         case CEPH_MSG_OSD_MAP:
2021         case CEPH_MSG_WATCH_NOTIFY:
2022                 return ceph_msg_new(type, front, GFP_NOFS, false);
2023         case CEPH_MSG_OSD_OPREPLY:
2024                 return get_reply(con, hdr, skip);
2025         default:
2026                 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2027                         osd->o_osd);
2028                 *skip = 1;
2029                 return NULL;
2030         }
2031 }
2032
2033 /*
2034  * Wrappers to refcount containing ceph_osd struct
2035  */
2036 static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2037 {
2038         struct ceph_osd *osd = con->private;
2039         if (get_osd(osd))
2040                 return con;
2041         return NULL;
2042 }
2043
2044 static void put_osd_con(struct ceph_connection *con)
2045 {
2046         struct ceph_osd *osd = con->private;
2047         put_osd(osd);
2048 }
2049
2050 /*
2051  * authentication
2052  */
2053 /*
2054  * Note: returned pointer is the address of a structure that's
2055  * managed separately.  Caller must *not* attempt to free it.
2056  */
2057 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
2058                                         int *proto, int force_new)
2059 {
2060         struct ceph_osd *o = con->private;
2061         struct ceph_osd_client *osdc = o->o_osdc;
2062         struct ceph_auth_client *ac = osdc->client->monc.auth;
2063         struct ceph_auth_handshake *auth = &o->o_auth;
2064
2065         if (force_new && auth->authorizer) {
2066                 if (ac->ops && ac->ops->destroy_authorizer)
2067                         ac->ops->destroy_authorizer(ac, auth->authorizer);
2068                 auth->authorizer = NULL;
2069         }
2070         if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
2071                 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2072                                                         auth);
2073                 if (ret)
2074                         return ERR_PTR(ret);
2075         }
2076         *proto = ac->protocol;
2077
2078         return auth;
2079 }
2080
2081
2082 static int verify_authorizer_reply(struct ceph_connection *con, int len)
2083 {
2084         struct ceph_osd *o = con->private;
2085         struct ceph_osd_client *osdc = o->o_osdc;
2086         struct ceph_auth_client *ac = osdc->client->monc.auth;
2087
2088         /*
2089          * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2090          * XXX which do we do:  succeed or fail?
2091          */
2092         return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
2093 }
2094
2095 static int invalidate_authorizer(struct ceph_connection *con)
2096 {
2097         struct ceph_osd *o = con->private;
2098         struct ceph_osd_client *osdc = o->o_osdc;
2099         struct ceph_auth_client *ac = osdc->client->monc.auth;
2100
2101         if (ac->ops && ac->ops->invalidate_authorizer)
2102                 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2103
2104         return ceph_monc_validate_auth(&osdc->client->monc);
2105 }
2106
2107 static const struct ceph_connection_operations osd_con_ops = {
2108         .get = get_osd_con,
2109         .put = put_osd_con,
2110         .dispatch = dispatch,
2111         .get_authorizer = get_authorizer,
2112         .verify_authorizer_reply = verify_authorizer_reply,
2113         .invalidate_authorizer = invalidate_authorizer,
2114         .alloc_msg = alloc_msg,
2115         .fault = osd_reset,
2116 };